[MRI in radiologically occult scaphoid fractures. Initial experiences with 1.0 Tesla (whole body-middle field equipment) versus 0.2 Tesla (dedicated low-field equipment)].
The study was performed to determine the diagnostic value of different MR systems and field strengths in patients with occult scaphoid and wrist fractures. Twelve patients with clinical suspicion of a scaphoid fracture but normal plain radiographs were examined by MRI. A dedicated 0.2-T unit (Esaote) and a 1.0-T unit (NT10, Philips) were used. Coronal T1W-SE, STIR, and T2*W-GE sequences were obtained with both systems. Images were evaluated for a bone marrow abnormality, a trabecular or cortical fracture line, and were compared to the 6-week follow-up radiographs. Seven wrist fractures were found at 0.2 T and 1.0 T, proven in the follow-up radiographs. A bone marrow abnormality was present in all seven fractures on both systems. Trabecular and cortical fracture lines were visualized at 0.2 T in four cases and at 1.0 T in seven cases. Low-field MR imaging at 0.2 T and mid-field MR imaging at 1.0 T seem to be equivalent in the diagnosis of a fracture in radiographically occult scaphoid and wrist fractures. In the visualization of fracture details, important for therapeutic and prognostic considerations, 1.0 T seems to be superior.
Breitenseher
M J
MJ
Abteilung für Osteologie der Univ. Klinik für Radiodiagnostik, Wien.
Trattnig
S
S
Gäbler
C
C
Happel
B
B
Bankier
A
A
Kukla
C
C
Rand
T
T
Imhof
H
H
D000293:Adolescent; D000328:Adult; D001853:Bone Marrow / Q000473:pathology; D002348:Carpal Bones / Q000293:injuries* / Q000473:pathology; D004867:Equipment Design; D005260:Female; D050723:Fractures, Bone / Q000175:diagnosis*; D006801:Humans; D008279:Magnetic Resonance Imaging / Q000295:instrumentation*; D008297:Male; D008875:Middle Aged; D012680:Sensitivity and Specificity; D014954:Wrist Injuries / Q000175:diagnosis*
MRT bei radiologisch okkulten Kahnbeinfrakturen. Erste Erfahrungen von 1.0 Tesla (Ganzkörper-Mittelfeldgerät) versus 0.2 Tesla (dediziertes Niederfeldgerät).